Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «U»:
U (uracil): A nucleotide base and one member of the A-U (adenine-uracil) base pair in RNA. The other base pair in RNA is G-C (guanine-cytosine).
Uracil takes the place in RNA that thymine (T) occupies in DNA....
U.S. National Library of Medicine (NLM)
U.S. National Library of Medicine (NLM): The world's largest medical library, the U.S. National Library of Medicine (NLM) is part of the National Institutes of Health (NIH).
The NLM has as its mission to collect, organize, and make available biomedical science information to investigators, educato...
UA: Abbreviation for urinalysis, a test that
determines the content of the urine. Because urine removes
toxins and excess liquids from the body, it can contain
important clues. Urinalysis can be used to detect some
types of disease, particularly in the case of metabolic
disorders and kidney dis...
UAA: A triplet consisting of uracil, adenine, adenine, in that order, that acts as a stop codon in messenger RNA (mRNA), signaling the termination of translation of an mRNA molecule and the release of the nascent polypeptide chain....
UAG: A triplet consisting of uracil, adenine, guanine, in that order, that acts as a stop codon in messenger RNA (mRNA), signaling the termination of translation of an mRNA molecule and the release of the nascent polypeptide chain....
UAL: UAL stands for ultrasonic-assisted liposuction.
Liposuction involves the surgical suctioning of fat deposits from specific parts of the body, the most common being the abdomen (the "tummy"), buttocks ("behind"), hips, thighs and knees, chin, upper arms, back, and calves. Liposuction breaks up a...
Ubidecarenone: See: Coenzyme Q10....
Ubiquinone: See: Coenzyme Q10....
Ubiquitin: A small but extremely important protein that acts the "kiss of death" to other proteins. Ubiquitin consists of only 76 amino acids. In the normal course of events, proteins are inactivated by the attachment of ubiquitin to them, a process called ubiquitination. Ubiquitin acts as a tag by ...
Ubiquitination: The "kiss of death" process for a protein. In ubiquitination, a protein is inactivated by attaching ubiquitin to it. Ubiquitin is a small molecule. It acts as a tag that signals the protein-transport machinery to ferry the protein to the proteasome for degradation. For more informati...
Ubiquitous: Present everywhere. The small protein called ubiquitin was so-named because it is present in all types of cells and its amino acid sequence is identical in all creatures from insects to humans....
UBT: Urea breath test....
UDP-glucuronosyltransferase: A liver enzyme essential to the disposal of bilirubin (the chemical
that results from the normal breakdown of hemoglobin from red blood cells).
An abnormality of this enzyme (UDP-glucuronosyltransferase) results in a condition called Gilbert's disease in which there are...
UGA: A triplet consisting of uracil,guanine, adenine, in that order, that acts as a stop codon in messenger RNA (mRNA), signaling the termination of translation of an mRNA molecule and the release of the nascent polypeptide chain....
UL: 1. Upper lid (of the eye).
2. Upper limit. No evidence was found for chronic excess intakes of potassium in apparently health individuals and therefore no UL was established for potassium....